skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Dynamic High-Temperature Tensile Characterization of an Iridium Alloy with Kolsky Tension Bar Techniques

Abstract

In this study, conventional Kolsky tension bar techniques were modified to characterize an iridium alloy in tension at elevated strain rates and temperatures. The specimen was heated to elevated temperatures with an induction coil heater before dynamic loading; whereas, a cooling system was applied to keep the bars at room temperature during heating. A preload system was developed to generate a small pretension load in the bar system during heating in order to compensate for the effect of thermal expansion generated in the high-temperature tensile specimen. A laser system was applied to directly measure the displacements at both ends of the tensile specimen in order to calculate the strain in the specimen. A pair of high-sensitivity semiconductor strain gages was used to measure the weak transmitted force due to the low flow stress in the thin specimen at elevated temperatures. The dynamic high-temperature tensile stress–strain curves of a DOP-26 iridium alloy were experimentally obtained at two different strain rates (~1000 and 3000 s -1) and temperatures (~750 and 1030°C). The effects of strain rate and temperature on the tensile stress–strain response of the iridium alloy were determined. Finally, the iridium alloy exhibited high ductility in stress–strain response that strongly dependedmore » on strain-rate and temperature.« less

Authors:
 [1];  [2];  [1];  [1];  [3];  [3]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE), Office of Space and Defense Power Systems (NE-75)
OSTI Identifier:
1340247
Alternate Identifier(s):
OSTI ID: 1265544
Report Number(s):
SAND2014-19729J
Journal ID: ISSN 2199-7446; 453040384
Grant/Contract Number:  
AC04-94AL85000; AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Dynamic Behavior of Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 3; Journal ID: ISSN 2199-7446
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Kolsky bar; high temperature; dynamic tension; iridium alloy; stress-strain response

Citation Formats

Song, Bo, Nelson, Kevin, Lipinski, Ronald, Bignell, John, Ulrich, G. B., and George, Easo P. Dynamic High-Temperature Tensile Characterization of an Iridium Alloy with Kolsky Tension Bar Techniques. United States: N. p., 2015. Web. doi:10.1007/s40870-015-0022-6.
Song, Bo, Nelson, Kevin, Lipinski, Ronald, Bignell, John, Ulrich, G. B., & George, Easo P. Dynamic High-Temperature Tensile Characterization of an Iridium Alloy with Kolsky Tension Bar Techniques. United States. doi:10.1007/s40870-015-0022-6.
Song, Bo, Nelson, Kevin, Lipinski, Ronald, Bignell, John, Ulrich, G. B., and George, Easo P. Fri . "Dynamic High-Temperature Tensile Characterization of an Iridium Alloy with Kolsky Tension Bar Techniques". United States. doi:10.1007/s40870-015-0022-6. https://www.osti.gov/servlets/purl/1340247.
@article{osti_1340247,
title = {Dynamic High-Temperature Tensile Characterization of an Iridium Alloy with Kolsky Tension Bar Techniques},
author = {Song, Bo and Nelson, Kevin and Lipinski, Ronald and Bignell, John and Ulrich, G. B. and George, Easo P.},
abstractNote = {In this study, conventional Kolsky tension bar techniques were modified to characterize an iridium alloy in tension at elevated strain rates and temperatures. The specimen was heated to elevated temperatures with an induction coil heater before dynamic loading; whereas, a cooling system was applied to keep the bars at room temperature during heating. A preload system was developed to generate a small pretension load in the bar system during heating in order to compensate for the effect of thermal expansion generated in the high-temperature tensile specimen. A laser system was applied to directly measure the displacements at both ends of the tensile specimen in order to calculate the strain in the specimen. A pair of high-sensitivity semiconductor strain gages was used to measure the weak transmitted force due to the low flow stress in the thin specimen at elevated temperatures. The dynamic high-temperature tensile stress–strain curves of a DOP-26 iridium alloy were experimentally obtained at two different strain rates (~1000 and 3000 s-1) and temperatures (~750 and 1030°C). The effects of strain rate and temperature on the tensile stress–strain response of the iridium alloy were determined. Finally, the iridium alloy exhibited high ductility in stress–strain response that strongly depended on strain-rate and temperature.},
doi = {10.1007/s40870-015-0022-6},
journal = {Journal of Dynamic Behavior of Materials},
issn = {2199-7446},
number = 3,
volume = 1,
place = {United States},
year = {2015},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: